It shall be unlawful for any body of men whatsoever, other than the regularly organized land and naval militia of this state, the land and naval forces of the United States, and the students of public or of regularly chartered educational institutions where military science is a prescribed part of the course of instruction, to associate themselves together as a military organization for drill or parade in public with firearms in this state, without special license from the governor for each occasion, and application for such license must be approved by the mayor and board of aldermen or commissioners of the town or city where such organization may propose to parade, and any person or persons participating in such unlawful association shall be guilty of a misdemeanor and on conviction of same shall be punished by imprisonment in the county jail for a term not to exceed six months or by a fine not to exceed five hundred dollars, or both fine and imprisonment, at the discretion of the court. Provided that the governor may permit the passage through or the attendance in the state of the organized militia of other states for the purpose of attending joint maneuvers, rifle competitions, or for such other purposes as he may deem proper.